Based on how anodizing works and the pot design, I'd say you had poor heat (cold) transfer from the walls to the base and the walls got rather warm.
Anodizing is a layer of aluminum oxide that gets dyed the color you want it. What point the dye boils/burns at is specific to the die.
I suspect that the walls were getting very hot and the base (where all the cold is) didn't have enough heat transfer to the walls to keep them cool, being as it is a separate part held on with the pot mounting.
Personally I'd use good old propane. Far less toxic.
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